



Patented Sept. 4, 1934 UNlT-ED STATES 1,972,111 COLORATION or TEXTILE MA'TERIALS George Rivat, Lyon, France, assignor to Celamse' Corporation of America, a corporation of Delaware No Drawing. Application February 18, 1932, Serial No. 593,884. In Great Britain February 14 Claims.

This invention relates to the treatment of textile materials, forexample filaments, fibres, threads, or fabrics, and in particular textile materials made of or containing cellulose esters or ethers,

5 to obtain fast colorations thereon.

It has been observed that colorations produced with some dyestuffs and especially with anthraquinone derivatives containing free amino or alkyl amino groups lack fastness to the combined l0 agencies of acid and light. In view of the fact that materials" are frequently required to withstand acid treatment and may also come into contact with acid combustion products in the atmosphere, this lack of fastness constitutes a certain drawback to the use of the aforesaid anthraqujnone derivatives as coloring. matters.

U. S. application S. No. 450,308 filed 6th May, 1930, describesimproving the fastness of colorations on textile materialswith the aid of one or more alkyl, aryl, or aralkyl derivatives of urea, thiourea, or guanidine. I have now found that the fastness of colorations, and particularly of colorations produced with anthraquinone derivatives containing free amino or alkyl amino or arylamino groups, especially 1:4-diaminoanthraquinone derivatives may be improved by means of,

thiourea itself.

- According to the present invention therefore, the fastness of colorations on textile materials is improved by incorporating in the materials thioureaand retaining said thiourea in the materials in any subsequent treatment to which the materials inay be subjected. The incorporation of thiourea may be effected prior to, at the sametime as, or subsequent to the coloration. of the materials. I

The improvement of the fastness of colorations, and particularly colorations produced with the above mentioned anthraquinone derivatives, by means of thiourea may be further accentuated by the simultaneous or separate application to, or incorporation in the materials of inorganic compounds having an alkaline reaction, that is to say, substances which are alkaline and contain an inorganic base, for example an alkali metal or other borate, e. g. borax, or sodium carbonate, disodium hydrogen phosphate, sodium acetate, sodium palmitate, or potassium oleate. The alkaline substance should not be in such concentration, nor. should it be so basic or alkaline as to aifect deleteriously the material, e. g. by hydrolysis'in the case of cellulose ester materials. Other substances adapted to increase the fastness of colorations may also be employed with thiourea in accordance with the present, invention, for example the substances 'mentionedin U, S.Paten't No.

1,723,230, U. S. applications S. Nos. 449,082 filed 1st May, 1930, 450,308 filed 6th May, 1930, 523,940 filed 19th March, 1931, 523,941filed 19thMarch, 1931, and British applicationNo. 4341/31 filed 11th February, 1931.

The thiourea may be incorporatedin'the ma;- terial by any convenient method. Thusfor ex ample in the case of artificial filaments of cellulose derivatives the thiourea may be dissolved or otherwise incorporated in the spinning solutions used for the manufacture. For instance,an' acetone solution of cellulose acetate containing up to 2 per cent. of thiourea on the weight of cellulose acetate may be spun by dry spinning methods to produce cellulose acetate filaments which are capable of being directly dyed in fast shades with I amino anthraquinone dyestufisf lt will'be 'ap-' preciated that care should be'taken' to avoid any subsequent treatment tending to remove "the thiourea from the material.

Preferably however the thiourea is applied either during a process 10f dyeing the material, or during a finishing treatment or other aftertreatment. In these cases the thiourea may be applied in any suitable form. The thiourea may for instance be applied in solution in water, alcohol or other organic solvent. The percentage of thiourea incorporated in the material may vary considerably and excellent results have been obtained by incorporating up to 2 per cent. of thiourea, for example 0.2 to 1 per cent of thiourea; in the material. 7

The thiourea may be incorporated in more or less concentrated dye preparations yielding by dilution with water, soap solution or the like, dyebaths suitable for the direct coloration of the textile materials in fast shades. The concentrated preparations may be in solid, powdered, paste, or liquid form, and may or may not contain other materials facilitating the application of the thiourea or the dyestuii's. For example they may contain dispersing agents and/or protective colloids to facilitate the dispersion of insoluble dyestufis or to maintain the dyestufis in the dispersed state.

The following examples illustrate the invention without being in any way limitative:

Example 1 shades with an alkylated 1:4-diaminoanthraquinone derivative, is impregnated in this bath, centrifuged and dried.

Example 2 'A woven fabric of cellulose acetate is, after dyeing, padded in a bath containing 2 grams per litre of thiourea and 2 grams per litre of borax. The excess liquid is pressed out and the material dried and finished.

As already indicated the invention is of particular value in rendering fast to the combined agencies of light and acid coloring matters pro-'- duced with anthraquinone derivatives containing free amino or alkyl amino or arylamino groups.

Coloring matters of this class are capable of yielding valuable colorationsf on cellulose esterand ether materials which are difficult to secure by means of other coloring matters. For this reason the incorporation of thiourea is most valuable in,co nnection withithe treatment of textile materials made of cellulose acetate or other cellulose esters or ethers, for instance cellulose form'ate, cellulose propionate', cellulose butyrate, or

other cellulose ester, or. methyl, ethyl, or benzyl cellulose or other cellulose ether, or materials containing such cellulose derivatives associated with other fibres, suchior example as wool, cot ton, regenerated cellulose and silk. The invention may, however, be applied to the treatment of materials consisting wholly of fibres other than cellulose derivative fibres.

What I claim and desire to secureby Letters- Patent is:

1. Method of improving the fastness of color-' ations on textile materialscomprising organic derivatives of cellulose comprising incorporatingv thiourea in the materials and retaining said thiourea in the materials during any, ishing treatment.

2. Method of improving the fastness of colorasubsequent fintions on textile materials comprising cellulose acetate comprising incorporating thiourea in the materials and retaining said thiourea in the materials during any subsequent finishing treatment.

3. Method of improving the fastness of colorations on textile materials comprising organic derivatives of cellulose dyed with anthraquinone dyestuffs comprising incorporating thiourea in the materials and retaining said thiourea in the materials during any subsequent finishing treatment.

4. Method of improving the fastness of colorations on textile materials comprising cellulose acetate dyed with amino anthraquinone dyestufis comprising incorporating thiourea in, the materials and retaining said thiourea'in the materials during any subsequent'finishing treatment.

5." Method of improving the fastness of colorations on textile materials comprising incorporating up to 2% of the weight of the materials of thiourea in the materials and retaining said thiourea in the materials during any subsequent finishing treatment. 1

6. Method of improving the fastness of colorations on textile materials comprising cellulose acetate dyed with amino anthraquinonedyestufis comprising incorporating up-to 2% of the weight of the materials of thiourea in the materials and retaining said thiourea in the materials during any subsequent finishing treatment.

7. Method of improving the fastness of colorations on textile materials comprising incorporating therein thiourea and a substance having an alkaline reaction and retaining said thiourea and thesubstance having an alkaline reaction in the materials during any subsequentv finishing treatment. I

.8. Methodof improving the fastness of colorationson textile materials comprising cellulose acetate dyed with amino anthraquinone dyestuffs comprising incorporating therein thiourea and a substance having an alkaline reaction and retaining said thiourea and the substance having an. alkaline reaction in the materials during any subsequent finishing treatment;

9. Method of improving the'iastness of colorations on textile materials comprising cellulose acetate dyed with amino anthraquinone dyestuffs to 2% of their weight of thiourea.

14. Textile materials comprising cellulose acetate and colored with an anthraquinone dyestuflf and containing up to 2% of their weight 01' thiourea.

- I GEORGE RIVAT. 

